My wife and I were at DLR April 2-4. We saw the projection show April 2. I thought it was an 8:30pm show, but I may be mistaken on the time. It was very crowded. I think we arrived about 30-40 minutes before the show started. We were on the main level next to the Falcon. CMs kept moving people back away from the Falcon. I feel like the CMs were still trying to figure out where people could stand, where to mark the walkways, etc.
As for the show, I enjoyed it. Would I do it again? only if I had time and was in the area. One cool part was when everyone in the audience raised their light sabers in the air. I wish I had one...
On nights when DL has fireworks, there is a themed show in GE with different music, etc., and the castle fireworks visible over the spires in GE. We did not attend the fireworks show in GE on 4/4, as we had preferred seats for Fantasmic and watched the fireworks from there (also with different music and also water projections).